“One thing that we know about PTSD is that most people following a trauma — specifically being confronted with, or personally experiencing, a life threatening situation — will actually have some of those symptoms that we might later call PTSD if they continue,” says Dr. Sheila Rauch (ADAA member), a major researcher in how PET works, Professor of Psychology at Emory University, and the Director of Research and Program Evaluation at the VA Atlanta Healthcare System. “Having flashbacks, thinking about the trauma a lot, pushing it away, are part of a normal response to trauma in the acute aftermath. But for some people, those memories get stuck. And that’s what we call PTSD.”